AM-DSB-SC - v 1 ( t ) v 1 ( t ) A LPF -B 0 B (b) Sketch the...

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The following block diagram (Fig.1-1) shows a communication system. For simplicity we assume that the signal is unchanged after the channel (no delay, no attenuation, no noise). Fig.1-1 The amplitude spectrum of the message signal, m (t), is shown in Fig.1-2 Fig. 1-2 (a) Sketch the amplitude spectrum of v 1 ( t ): | V 1 ( f )|; label important frequencies and amplitude values. 10 -10 f (Hz) |M(f)| 1 × Channel × mixer mixer cos(2000 п t) v 2 ( t ) v out ( t ) cos(2000 п t) m ( t ) Modulator Demodulator
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Unformatted text preview: v 1 ( t ) v 1 ( t ) A LPF -B 0 B (b) Sketch the amplitude spectrum of v 2 ( t ): | V 2 ( f )|; label important frequencies and amplitude values. (c) If the output signal of the demodulator is exactly the same as the input signal, i.e., v out (t)= m (t), find out the magnitude, the minimal bandwidth and the maximum bandwidth of the lower pass filter (LPF) shown in Fig. 1-1, i.e., the values of A , the minimum B and the maximum B ....
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This note was uploaded on 07/16/2009 for the course SYSC 3501 taught by Professor Osama during the Summer '09 term at Carleton CA.

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AM-DSB-SC - v 1 ( t ) v 1 ( t ) A LPF -B 0 B (b) Sketch the...

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